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<pre><code class="lang-java">
<span class="hljs-keyword">package</span> mediator;
<span class="hljs-keyword">import</span> java.util.*;
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MediatorPattern</span>
</span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span>
    </span>{
        Mediator md=<span class="hljs-keyword">new</span> ConcreteMediator();
        Colleague c1,c2;
        c1=<span class="hljs-keyword">new</span> ConcreteColleague1();
        c2=<span class="hljs-keyword">new</span> ConcreteColleague2();
        md.register(c1);
        md.register(c2);
        c1.send();
        System.out.println(<span class="hljs-string">&quot;-------------&quot;</span>);
        c2.send();
    }
}
<span class="hljs-comment">//&#x62BD;&#x8C61;&#x4E2D;&#x4ECB;&#x8005;</span>
<span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Mediator</span>
</span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">register</span><span class="hljs-params">(Colleague colleague)</span></span>;
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">relay</span><span class="hljs-params">(Colleague cl)</span></span>; <span class="hljs-comment">//&#x8F6C;&#x53D1;</span>
}
<span class="hljs-comment">//&#x5177;&#x4F53;&#x4E2D;&#x4ECB;&#x8005;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConcreteMediator</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Mediator</span>
</span>{
    <span class="hljs-keyword">private</span> List&lt;Colleague&gt; colleagues=<span class="hljs-keyword">new</span> ArrayList&lt;Colleague&gt;();
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">register</span><span class="hljs-params">(Colleague colleague)</span>
    </span>{
        <span class="hljs-keyword">if</span>(!colleagues.contains(colleague))
        {
            colleagues.add(colleague);
            colleague.setMedium(<span class="hljs-keyword">this</span>);
        }
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">relay</span><span class="hljs-params">(Colleague cl)</span>
    </span>{
        <span class="hljs-keyword">for</span>(Colleague ob:colleagues)
        {
            <span class="hljs-keyword">if</span>(!ob.equals(cl))
            {
                ((Colleague)ob).receive();
            }   
        }
    }
}
<span class="hljs-comment">//&#x62BD;&#x8C61;&#x540C;&#x4E8B;&#x7C7B;</span>
<span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Colleague</span>
</span>{
    <span class="hljs-keyword">protected</span> Mediator mediator;
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setMedium</span><span class="hljs-params">(Mediator mediator)</span>
    </span>{
        <span class="hljs-keyword">this</span>.mediator=mediator;
    }   
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">receive</span><span class="hljs-params">()</span></span>;   
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">send</span><span class="hljs-params">()</span></span>;
}
<span class="hljs-comment">//&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConcreteColleague1</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Colleague</span>
</span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">receive</span><span class="hljs-params">()</span>
    </span>{
        System.out.println(<span class="hljs-string">&quot;&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;1&#x6536;&#x5230;&#x8BF7;&#x6C42;&#x3002;&quot;</span>);
    }   
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">send</span><span class="hljs-params">()</span>
    </span>{
        System.out.println(<span class="hljs-string">&quot;&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;1&#x53D1;&#x51FA;&#x8BF7;&#x6C42;&#x3002;&quot;</span>);
        mediator.relay(<span class="hljs-keyword">this</span>); <span class="hljs-comment">//&#x8BF7;&#x4E2D;&#x4ECB;&#x8005;&#x8F6C;&#x53D1;</span>
    }
}
<span class="hljs-comment">//&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConcreteColleague2</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Colleague</span>
</span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">receive</span><span class="hljs-params">()</span>
    </span>{
        System.out.println(<span class="hljs-string">&quot;&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;2&#x6536;&#x5230;&#x8BF7;&#x6C42;&#x3002;&quot;</span>);
    }   
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">send</span><span class="hljs-params">()</span>
    </span>{
        System.out.println(<span class="hljs-string">&quot;&#x5177;&#x4F53;&#x540C;&#x4E8B;&#x7C7B;2&#x53D1;&#x51FA;&#x8BF7;&#x6C42;&#x3002;&quot;</span>);
        mediator.relay(<span class="hljs-keyword">this</span>); <span class="hljs-comment">//&#x8BF7;&#x4E2D;&#x4ECB;&#x8005;&#x8F6C;&#x53D1;</span>
    }
}
</code></pre>
<h3 id="&#x573A;&#x666F;&#x6A21;&#x62DF;">&#x573A;&#x666F;&#x6A21;&#x62DF;</h3>
<p>&#x5C31;&#x6A21;&#x62DF;qq&#x804A;&#x5929;</p>
<p>&#x6211;&#x901A;&#x8FC7;qq&#xFF0C;&#x53EF;&#x4EE5;&#x968F;&#x65F6;&#x548C;&#x901A;&#x8BAF;&#x5F55;&#x91CC;&#x7684;&#x4EBA;&#x804A;&#x5929;</p>
<ul>
<li>&#x62BD;&#x8C61;&#x4E2D;&#x4ECB;&#x8005;&#xFF1A;&#x804A;&#x5929;&#x5DE5;&#x5177;</li>
<li>&#x5177;&#x4F53;&#x4E2D;&#x4ECB;&#x8005;&#xFF1A;qq</li>
<li>&#x62BD;&#x8C61;&#x540C;&#x4E8B;&#xFF1A;qq&#x7528;&#x6237;</li>
<li>&#x5177;&#x4F53;&#x540C;&#x65F6;&#xFF1A;&#x5F20;&#x4E09;&#x3001;&#x674E;&#x56DB;&#x3001;&#x738B;&#x4E94;</li>
</ul>
<p><img src="https://raw.githubusercontent.com/larscheng/myImg/master/blogImg/DesignPatterns/20190717171358.png" alt=""></p>

                                
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